Concrete slab



FIG. 1 is a perspective view of a concrete slab that embodies my design;

FIG. 2 is a top view of the concrete slab of FIG. 1;

FIG. 3 is a front view of the concrete slab of FIG. 1;

FIG. 4 is a side view of the concrete slab of FIG. 1;

FIG. 5 is an enlarged cross-sectional view taken along 5-5 of FIG. 2;and,

FIG. 6 is a top view of an alternate embodiment of a concrete slab thatembodies my design.

CLAIM The ornamental design of a concrete slab, as shown and described.